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Method for producing R-Fe-B permanent magnet, and lubricating agent for use in shaping the same

A molding process and lubricant technology, applied in the direction of magnetic objects, metal processing equipment, magnetic materials, etc., can solve the problems of difficult removal of binders and molded product strength, poor productivity, and reduced magnet performance

Inactive Publication Date: 2005-01-05
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method using the above-mentioned lubricant faces problems in that it is difficult to remove the binder and the strength of the molded product is poor, resulting in poor productivity
[0013] Moreover, in order to improve the moldability, it is recommended to add a binder with excellent adhesion such as PVA (polyvinyl alcohol) etc. during the granulation of the magnet powder, however, the removal of the binder during the sintering process encounters various problems. This kind of problem, but also the following problem: Special handling such as in H 2 Sintering in a reducing atmosphere, etc. will be necessary, as the amount of C remaining in the sintered body increases, the magnet performance will decrease, etc.

Method used

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  • Method for producing R-Fe-B permanent magnet, and lubricating agent for use in shaping the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Electrolytic iron with a purity of 99.9%, an iron-boron alloy containing 19.8% by weight of B, and Nd and Dy with a purity of 99.7% or more were used as starting alloys. They are mixed at high frequency and then melted. They were cast into a mold with a water-cooled casting mold to obtain a billet with a composition of 14.5 at% Nd-0.5 at% Dy-78.8 at% Fe-6.2 at% B.

[0066] Then the above billet was crushed with a hammer mill, and further pulverized under the protection of a hydrogen atmosphere to obtain a crushed powder with an average particle size of 40 μm. The obtained crushed powder passed through at 6kg / mm 2 The pulverization was carried out by a jet mill under the condition of gas pressure and using an inert gas (nitrogen), thereby obtaining a fine powder with an average particle diameter of 3 μm.

[0067] Methyl caproate lubricant (boiling point: 150°C, active ingredient: 10%, Paresu Kagaku Co., Ltd., Magurupu PS-A-21) and methyl caprylate lubricant (boiling po...

Embodiment 2

[0075] Electrolytic iron with a purity of 99.9%, an iron-boron alloy containing 19.89% by weight of B, and Nd and Dy with a purity of 99.7% or more were used as starting alloys. They were mixed and melted at high frequency, and then they were cast into a mold with a water-cooled casting mold to obtain a billet.

[0076] Then the above blank was crushed with a hammer mill, and further dissociated under the protection of a hydrogen atmosphere to obtain a crushed powder with an average particle size of 40 μm. The obtained crushed powder passed through at 6kg / mm 2 The pulverization was carried out by a jet mill under the condition of gas pressure and using an inert gas (nitrogen), thereby obtaining a fine powder with an average particle diameter of 3 μm.

[0077] A copolymer of isobutene and n-butene with a molecular weight of 550 as a depolymerized polymer, a dynamic viscosity of 5 mm at 40° C. as a low-viscosity mineral oil 2 / s paraffin pure mineral oil, and as a hydrocarbon...

Embodiment 3

[0096] Electrolytic iron with a purity of 99.9%, an iron-boron alloy containing 19.8% by weight of B, and Nd and Dy with a purity of 99.7% or more were used as starting alloys. They were mixed and melted at high frequency, and cast into a mold with a water-cooled casting mold to obtain a billet with a composition of 13.4at%Nd-2.6at%Dy-77.8at%Fe-6.2at%B.

[0097] Then the above blank was crushed with a hammer mill, and further crushed under the protection of a hydrogen atmosphere to obtain a crushed powder with an average particle size of 40 μm. The obtained crushed powder passed through at 6kg / mm 2 The pulverization was carried out by a jet mill under the condition of gas pressure and using nitrogen as an inert gas, thereby obtaining a fine powder with an average particle diameter of 3 μm.

[0098] Mixtures of various lubricants 1, 2 were added to the obtained fine R-Fe-B crushed powder and mixed as shown in Table 10. Methyl caproate and methyl octanoate or Ti coupling agent...

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Abstract

The invention relates to a method for producing an R-Fe-B permanent magnet, wherein, R refers to lanthanon. The method comprises the steps as follow: 0.01 to 10.0 wt% of lubricant for pressing a mould, which has an uncoiled polymer, is added into and mixed with the R-Fe-B alloy powders; and then the mixture is pressed through a module in a magnetic field and then is sintered, wherein, the quality percent is calculated based on the quality of the R-Fe-B alloy powders. The invention also relates to a lubricant for module-pressing the magnet.

Description

[0001] This application is a divisional application, the application date of its parent application is April 22, 1999, the application number is 99800866.4, and the title of the invention is "Method for producing R-Fe-B magnet and lubricant for molding the magnet" ". technical field [0002] The present invention relates to a method of producing R-Fe-B permanent magnets, with which high crystal orientation can be obtained and molded products have high strength, so that the productivity is excellent. The present invention relates to a method for producing R-Fe-B magnets, in which high crystal orientation is obtained, the strength of molded articles is significantly improved, and R-Fe-B magnets with high Br can be mass-produced with good yields, measures Yes: Lubricant for molding magnets by adding and mixing, characterized by specific amounts of methyl caproate and / or methyl octanoate (with which high crystal orientation can be obtained), and containing The lubricants of the d...

Claims

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Application Information

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IPC IPC(8): B22F1/10H01F1/057
CPCB22F1/0059H01F1/0577B22F1/10
Inventor 金子裕治马场顺一郎田中和雄森静男
Owner HITACHI METALS LTD
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